Makerfire&reg; High Precision G.T. Power RC Watt Meter and Power Analyzer 130 Amps Prevents peak currents damaging battery, ESC, motors, wiring and connectors Verifies sufficient operating voltage under load Individual cell balancing.Set cutoff voltages, check battery capacity health Confirms proper battery charger operation (connect between your battery and charger) Detect receivers and actual operating current so as to make sure whether an UBEC is needed